Term: Jahn–Teller transition
https://doi.org/10.1351/goldbook.J03362

Definition:
A displacive crystal distortion to lower symmetry that cooperatively removes a localized-electron orbital degeneracy at an array of like atoms so as to leave the atoms in the centre of symmetry of their distorted sites. Example: The crystallographic distortion in Mn3O4.

Related Terms:
1) degeneracy (http://doi.org/10.1351/goldbook.D01556).

Source: PAC, 1994, 66, 577. 'Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)' on page 584 (https://doi.org/10.1351/pac199466030577)

Citation: 'Jahn–Teller transition' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.J03362

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